Fred Trelfa Collection

    Trelfa number 4-1990. Original image damaged - looks to be a peeling negative.

    Aerial view from Potter Hill Farm (center lower left) to Four Mile Dam (upper left) along the Thunder Bay River and Long Rapids Road, Alpena County, Michigan

    Trelfa number 4-1504R

    Trelfa number 4-523

    From Centennial History of Alpena County, Michigan (1892/1903) by David D. Oliver, page 31: "The Trowbridge dam slacks the water up the river a short distance above the North Branch, and the perpendi

    Trelfa number 4-1965

    Trelfa number 4-1967

    Trelfa number Sep-45

    Trelfa number 4-1968

    Trelfa number 4-2049